问题
I have a project (big project), that takes about 30 minutes to be indexed by Xcode. Xcode consumes 100% of my CPU for 30mn.
OK why not, that sounds a bit rude to use 100% of the CPU for a background task, but why not.
Now, if after 30 minutes, I quit Xcode, and re-open it, without touching a single file of my project, it starts again to index for 30 minutes.
Is this the intended behaviour? Is there a way to fix it? I don't want to turn off inedxing, I tried it, and code completion is HS.
回答1:
Try adding this flag to your build settings.
Xfrontend -warn-long-expression-type-checking=400
It will cause warning where the compiler take a long time to deduce a complex expression.
This may cause a build error which will go away after you find the slow expressions and then remove the build flag.
来源：https://stackoverflow.com/questions/49274982/xcode-9-2-is-re-indexing-from-scratch-each-time-i-open-it-even-if-nothing-chang